Cirrus SR22 Pilot Operating Handbook page 280

S 7: A
ECTION IRPLANE AND
A
VIONICS
GCU 479 Flight Management System Keyboard
The Flight Management System Keyboard is found on the upper section of
the center console and is the primary interface for avionics system data
entry, PFD/MFD operation, NAV/COM tuning, and course selection.
28 VDC for Flight Management System Keyboard operation is supplied
through the 5-amp KEYPADS / AP CTRL circuit breaker on MAIN BUS 1.
GSU 75 Air Data, Attitude and Heading Reference System
(ADAHRS)
The Air Data, Attitude Heading and Reference System (ADAHRS) unit(s),
mounted behind the PFD, includes the Attitude and Heading Reference
System (AHRS) and the Air Data Computer (ADC).
The AHRS provides airplane attitude and heading information to both the
PFD and the primary ADC. The AHRS contains advanced sensors
(including accelerometers and rate sensors), and interfaces with the
primary Magnetometer to obtain magnetic field information, the ADC to
obtain air data, and both Integrated Avionics Units to obtain GPS informa-
tion.
The ADC processes data from the Pitot/Static system and outside air
temperature (OAT) sensor(s). The ADC provides pressure altitude,
airspeed, vertical speed and OAT information to the Integrated Avionics
System, and communicates with the PFD, Integrated Avionics Unit, and
AHRS. The ADC is also connected directly to the Outside Air Temperature
probe(s) and Pitot-Static System.
28 VDC for ADAHRS 1 operation is supplied through the 5-amp ADAHRS
1 circuit breaker on ESS BUS 1. If installed, 28 VDC for ADAHRS 2 opera-
tion is supplied through the 5-amp ADAHRS 2 circuit breaker on MAIN
BUS 2.
7-74
S
YSTEMS
C D
IRRUS ESIGN
SR22
P/N 13772-006
Reissue A